Intrinsic magnetic moment of the electron (illustration only)
The rotation of all the constituent elements produces the same magnetic moment (μE) as a closed circular spiral of radius (R) traveled by an electric current of intensity (I).
Expression for R calculation
Value of the electron radius under the conditions of the Stern – Gerlach experiment
R = 386,6 fm
Simplified mechanism for neutron formation in hydrogen protostar nuclei
Due to the high gravitational pressure, the hydrogen atoms decrease in volume due to electron degeneracy and the orbital electron approaches the central proton.
To initiate the transfer of electric charge and energy from the orbital electron to the central proton, the distance between their centers of electric charge must be at least the radius of the electron R multiplied by one plus the fine-structure constant α. 
Orbital electron and central proton, at the start of the formation of a neutron (illustrative drawing only)
Initial position Initial position plus half a turn of the electron
Expression for R calculation
Electron radius value under the conditions of the natural neutron formation process
R = 153,8 fm